Monitor Refresh Rate Test — Test Hz & Screen Monitor Test

Check your display speed with our free online monitor refresh rate test and screen test hz tool. Whether you need a quick monitor test for a new 144Hz or 240Hz gaming display or want to verify your current Windows and macOS settings, hit Start to measure your exact refresh rate and frame stability in seconds.

Test 1
Choose UFO Style
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Refresh Rate & Test Hz
Press Start Test — measure your screen Hz and run a live monitor test
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Testing Refresh Rate…
Sampling display frames — keep this tab focused for an accurate monitor test
Wait... Checking
Sampling display frames—
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Frame Interval
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Peak Hz
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Stability
Hz Per Second — Frame Rate Breakdown
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Peak Hz
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Best Hz

📈 Session Stats

Refresh Rate—
Average Hz—
Minimum Hz—
Maximum Hz—
Frame Time—
Elapsed Time—
1% Low Hz—
0.1% Low Hz—
95th Percentile—
99th Percentile—
Std Deviation—
Stutter %—
Total Frames—
Dropped Frames—
Min Frame Time—
Max Frame Time—
Frame Time Range—
Consistency Score—
Median Hz—

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Screen Refresh Rate Tiers — Test Hz Speed Guide

<30 Hz
Very Low
30 Hz
Low
60 Hz
Standard
75 Hz
Above Average
120 Hz
Smooth
144 Hz
Gaming
165 Hz
High-End
240+ Hz
Esports
Live Monitor Test — Continuous Refresh Rate
—Hz
Continuously measured from your display's real frame timing — always on, like testufo.com/refreshrate
Decimal Digits
How many digits after the decimal point in the Hz reading
Averaging Window (sec)
How many recent seconds of frames are used to calculate Hz
Update Interval (ms)
How often the on-screen number refreshes
Smoothing (%)
Higher smoothing reduces jitter but reacts more slowly to real changes
?? Multiple Framerates — UFO Motion Comparison - UFOtest
Speed scales with Hz — 15Hz crawls, 360Hz zips by. Higher Hz = faster AND smoother motion.
Frame Rate vs Refresh Rate — UFO Motion & Display Monitor Test
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Pixels Per Sec
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Frame Rate
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Refresh Rate
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Pixels Per Frame
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Frame Interval
Pixel Scale:
Speed:
UFO Size:

Refresh Rate Diagnostics & Screen Test Hz Controls

Diagnostic Test Protocol
Select scan mode for frame pacing and micro-stutter verification.
Target Benchmark Tier
Compare current display performance against native hardware ratings.
Sample Duration Window
Length of frame sampling cycle to compute true refresh average.
Frame Delta Jitter Threshold
Tolerance window before frame interval variance flags micro-stutter.
Visual Guide Theme
Select active color theme for UI accents and test indicators.
Audio Synthesizer
Acoustic cues for benchmark start, completion, and stutter drops.
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Understanding Refresh Rate & Smooth Motion

Your screen refresh rate measures how many times per second your monitor redraws the picture, measured in Hertz (Hz). A 60Hz screen updates 60 times a second, while a 144Hz or 240Hz screen updates much faster. Higher Hz makes cursor movement smoother, cuts down motion blur, and helps you track moving targets. Running an online monitor test confirms that your display is running at full speed, while our monitor ghosting tool lets you check for trailing behind fast-moving images.

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How to Test Hz & Fix 60Hz Display Caps

Many players buy a 144Hz or 240Hz gaming display but unknowingly run it at 60Hz for months. When you plug in a new monitor, Windows and macOS often default to 60Hz until you change it. Use this tool to test hz output right in your browser. If your screen tests at 60Hz, open your display settings, select the highest refresh rate available, enable hardware acceleration in your browser, and test hardware delay with our input lag tool.

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Refresh Rate (Hz) vs Frame Rate (FPS)

Refresh rate is what your physical monitor can show, while frame rate (FPS) is how many frames your graphics card creates each second. If your graphics card outputs 200 FPS but your screen is 60Hz, you only see 60 updates each second and may notice screen tearing. For the smoothest gameplay, match your frame rate to your screen using G-Sync or FreeSync. Check your live rendering speed with our fps tester to see how your GPU performs.

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Spotting Micro-Stutter with a Monitor Test

A monitor can report an average 144Hz and still feel jerky if frames arrive late. That uneven delivery is called micro-stutter. On a steady 144Hz display, every frame arrives every 6.94 milliseconds, while 240Hz takes 4.17 milliseconds. If background apps or driver glitches delay frames, motion stutters. When you run our monitor test, the stability score and frame interval graph show you if your display timing is consistent. You can also test your reflexes with our visual reaction test.

Monitor Refresh Rate Test — Frequently Asked Questions

This monitor test uses the browser's built-in requestAnimationFrame loop to record when each frame paints on your screen. By measuring the exact time between consecutive frames with sub-millisecond precision, it calculates your true display refresh rate in Hertz (Hz).
New high-refresh monitors often default to standard 60Hz when first plugged in. Running a quick test Hz check confirms whether your operating system and graphics card are sending frames at 120Hz, 144Hz, 240Hz, or 360Hz, ensuring you get the performance you paid for.
Refresh rate (Hz) is the speed at which your monitor panel physically refreshes its pixels each second. Frame rate (FPS) is the number of frames your computer's graphics card produces per second. For the smoothest image, your graphics card should output enough FPS to match or exceed your monitor's refresh rate.
If your monitor is rated for 144Hz or higher but tests at 60Hz, open Windows Display Settings → Advanced Display (or System Settings → Displays on macOS) and choose your maximum refresh rate from the dropdown. Also verify that browser hardware acceleration is turned on and that you are using a DisplayPort 1.4 or HDMI 2.0+ cable.